Hello,
I'm trying to determine if a string contains asterisks using the grep
function. I know that this is slightly difficult because * is a special
character in regular expressions and needs to be escaped. However, escaping
the * using \ doesn't work either:
if(grep("\*", model)>0) #does the model have an interaction
{
do something...
}
produces the following error message:
Error in grep("*", model) : invalid regular expression '*'
In addition: Warning messages:
1: '\*' is an unrecognized escape in a character string
2: unrecognized escape removed from "\*"
3: In grep("*", model) :
regcomp error: 'Invalid preceding regular expression'
Execution halted
Any ideas anyone?
Robin
--
View this message in context:
http://www.nabble.com/grep-for-asterisks-%22*%22%27s-tp20644195p20644195.html
Sent from the R help mailing list archive at Nabble.com.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
